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Prism correction is measured in prism dioptres. A prescription that specifies prism correction will also specify the "base". The base is the thickest part of the lens and is opposite from the apex. Light will be bent towards the base and the image will be shifted towards the apex. In an eyeglass prescription, the base is typically specified as up, down, in, or out, but left and right are also ...
Esophoria is an eye condition involving inward deviation of the eye, usually due to extra-ocular muscle imbalance. It is a type of heterophoria .
The Maddox rod test can be used to subjectively detect and measure a latent, manifest, horizontal or vertical strabismus for near and distance. The test is based on the principle of diplopic projection. [1] Dissociation of the deviation is brought about by presenting a red line image to one eye and a white light to the other, while prisms are ...
Criticism of Google. Criticism of Google includes concern for tax avoidance, misuse and manipulation of search results, its use of others' intellectual property, concerns that its compilation of data may violate people's privacy and collaboration with the US military on Google Earth to spy on users, [1] censorship of search results and content ...
A subscriber to a channel on the American video-sharing platform YouTube is a user who has chosen to receive the channel's content by clicking on that channel's "Subscribe" button, and each user's subscription feed consists of videos published by channels to which the user is subscribed. [1] The ability for users to subscribe was introduced in October 2005. [2] YouTube began publishing a list ...
In ophthalmology, horror fusionis is a condition in which the eyes have an unsteady deviation, with the extraocular muscles performing spasm-like movements that continuously shift the eyes away from the position in which they would be directed to the same point in space, giving rise to diplopia. Even when the double vision images are made to nearly overlap using optical means such as prisms ...
YouTube is an American video-sharing website headquartered in San Bruno, California. The site indicates view counts of each uploaded video, making it possible to keep track of the most viewed, many of which continue to exist while others are no longer available on the site. Although the most-viewed were initially viral videos uploaded by amateur content creators, such as " Evolution of Dance ...
The following table lists the 50 most-viewed YouTube channels as well as the primary language and content category of each channel. The channels are ordered by number of views. The top 50 most-viewed channels have all surpassed 30 billion total views. [1] [6]
This list of most-liked YouTube videos contains the top 30 videos with the most likes of all time, taken directly from the video page. The American video platform YouTube implemented a like and dislike button on these pages in March 2010, part of a major redesign of the site. This served as a replacement for their five-star rating system; [1] YouTube's designers found the previous system ...
YouTube (formerly YouTube Spotlight) is the official YouTube channel for the American video-sharing platform YouTube, spotlighting videos and events on the platform.